毕业设计论文外文翻译-jpeg标准研究及算法实现.doc

毕业设计论文外文翻译-jpeg标准研究及算法实现.doc

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JPEG2000图像压缩标准简介

郑州轻工业学院

本科毕业设计（论文）

——英文翻译

题目JPEG标准研究及算法实现

学生姓名

专业班级电子信息07级1班

学号

院（系）计算机与通信工程学院

指导教师

完成时间2011年4月10日

英文原文

JPEG2000imagecompressionstandard

andcharacteristics

Abstract

Withthedevelopmentofthenetworkandmultimediatechnologies,peopleneedmoreandmoreimageswithhighfunctionandquantity,sothecompressiveimagetechniquesrequirehigherperformanceaswellasnewcharacteristicstosatisfysomespecialuse.Forthis,ISOreleasedagainanewstaticimagecompresstechnique-JPEG2000,whichmaybecomethenewimagecompressionstandardinthefuture.

JPEG2000istoadapttothecontinuousdevelopmentofimagecompressionapplications,theemergenceofnewstillimagecompressionstandard.JPEG2000imagecodingsystemdescribestherealizationoftheprocess,ofwhichthebasicalgorithmusedisdescribedandkeytechnologies,introducedthenewstandardfeaturesandapplications,anditsperformanceisanalyzed.Withtherapidgrowthofmultimediaapplicationsandnetworkscontinuestodevelop,thetraditionalJPEGcompressiontechnologyhasbeenunabletomeetthepeople'sdigitalmultimediaimagedatarequirements,amorepowerfulandefficientsuperiorstillimagecompressionstandardhasbeenreferredtothedevelopmentagenda,thisisaJPEG2000.

1.Introduction

JPEG（JointPhotographicExpertsGroup）istheInternationalOrganizationforStandardization（ISO）developedundertheleadershipofthecommitteestillimagecompressionstandard,thefirstsetofinternationalstillimagecompressionstandardISO10918-1（JPEG）isthatestablishedbytheCommittee.AstheexcellentqualityJPEG,sothatwithinafewyearshewasagreatsuccess,iswidelyusedinthefieldofInternetanddigitalcamerasonthesite80%haveadoptedtheJPEGimagecompressionstandard.However,thecurrentJPEGstillimagecompressionstandard,withmid-rangeandhigh-bit-rateontheratedistortioncharacteristicsofagood,butinthecontextoflowbitrate,therewillbeobviousblockingeffects,itsqualityhasbecomeunacceptable.JPEGcannotbeprovidedinasinglestreamlossyandlosslesscompression,andcannotsupportmorethan64×64Koftheimagecompression.Atthesametime,despitethecurrentJPEGstandardhasarequirementtorestarttheinterval,butwhenbiterrorsencounteredwhentheimagequalitywillbeseriouslydamaged.Tosolvetheseproblems,sinceMarch1997onwards,JPEGimagecompressionstandardscommitteestartedtodevelopanewgenerationofimagecompressionstandardtoaddresstheseproblems.InMarch2000theTokyoconferencetoidentifyanewgenerationofcolorstillimagecodingstandardJPEG2000imagecompressioncodingalgorithm.

2.JPEG2000imagecompressionstandardprofile

JPEG2000systemisdividedintothefollowingsevenparts:



①JPEG2000imagecodingsystem

②Expansion（tothecoreofthedefinition①addmorefeaturesandsophistication）;

③movementJPEG2000;

④consistency;

⑤referencesoftware（nowincludesJavaandCimplementation）;

⑥compoundimagefileformat（fordocumentscanningandfaxapplications）;

⑦oftheminimumsupportto①（technicalreport）.

①asfullyaccreditedISOstandardthatdefinesthecorecompressionandminimumfileformats,②~⑥definitionofcompressionandexpansionoffileformats.Which,①hasbeenfinalized,andotherarestillinprocess.DiscussedinthisarticleisbasedontheJPEG2000standardPart1.

Intheencoder,firstlythesourceimagesoftheresultofthepre-treatment,todealwiththeresultsofdiscretewavelettransform,waveletcoefficientsobtained.Thenthewaveletcoefficientswerequantizativedandentropycoding,thefinalcompositionofthestandardoutputcodestream（bitstream）.Decodersareencoderreverseprocess,Firsttocodeflowunpackandentropydecoding,andthenreversetoquantifyanddiscretewaveletinversetransform,inversetransformtheresultsofthepost-processingsynthesis,wehavereconstructedimagedata.AlthoughJPEG2000andJPEGencodinganddecodingprocessissimilar,thereisaverybigdifferencebetweenthetheconcreterealizationofeachstep.Thegeneralstepsintheencodingprocessisasfollows:



（1）composedofmorethanonecolorcomponentimageisdecomposedintoasinglecolorcomponentimage.Therearecertaincorrelationbetweenweightbydecompositionrelatedcomponents,throughthedecompositionoftherelevantcomponentstransformcanreducetheredundancybetweenthedatatoimprovecompressionefficiency;

（2）componentsoftheimageisdecomposedintoarectanglethesizeofaunifiedpiece-theimagechip.Imagefilmistransformed,andthebasicunitofencodinganddecoding;

（3）Everyi